Released earlier this year, this QD-enhanced 55-inch TV from TCL features fluorescent nanocrystal technology developed by QD Vision. The company's QDs are based on cadmium selenide, while rivals Nanosys and Nanoco are both working to advance cadmium-free alternatives. Nanoco and QD Vision are now engaged in a war of words over the perceived legality of displays using cadmium-based QDs in Europe. Image: TCL.